Datasheet

Detailed Description
Rail-to-Rail Output Stage
The MAX4480–MAX4483 can drive a 5kΩ load and still
typically swing within 80mV of the supply rails. Figure 1
shows the MAX4480 output voltage swing configured with
A
V
= +10V/V.
Driving Capacitive Loads
Driving a capacitive load can cause instability in many op
amps, especially those with low quiescent current. The
MAX4480–MAX4483 are unity-gain stable for a range
of capacitive loads to above 400pF. Figure 2 shows the
MAX4480 response with an excessive capacitive load.
Adding a series resistor between the output and the load
capacitor (Figure 3) improves the circuit’s response by
isolating the load capacitance from the op amp’s output.
Figure 1. Rail-to-Rail Output Operation
PIN
NAME FUNCTION
MAX4480 MAX4481 MAX4482 MAX4483
1 1 — — IN+ Noninverting Amplier Input
— — 3 3 INA+ Noninverting Amplier Input A
— — 5 5 INB+ Noninverting Amplier Input B
— — — 10 INC+ Noninverting Amplier Input C
— — — 12 IND+ Noninverting Amplier Input D
2 2 4 11 V
SS
Negative Supply. Connect to ground for single-supply
operation. Use a 0.01μF bypass capacitor to GND.
3 3 — — IN- Inverting Amplier Input
— — 2 2 INA- Inverting Amplier Input A
— — 6 6 INB- Inverting Amplier Input B
— — — 9 INC- Inverting Amplier Input C
— — — 13 IND- Inverting Amplier Input D
4 4 — — OUT Amplier Output
— — 1 1 OUTA Amplier Output A
— — 7 7 OUTB Amplier Output B
— — — 8 OUTC Amplier Output C
— — — 14 OUTD Amplier Output D
5 6 8 4 V
DD
Positive Supply. Use a 0.01μF bypass capacitor to GND.
— 5 — — SHDN
Active-Low Shutdown Input. Connect to V
DD
for
normal operation. Do not leave oating.
1V/div
100µs/div
MAX4480–MAX4483 Single/Dual/Quad, Low-Cost, Single-Supply,
Rail-to-Rail Op Amps with Shutdown
www.maximintegrated.com
Maxim Integrated │ 7
Pin Description